大学英语六级分类模拟题379及答案解析.doc

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1、大学英语六级分类模拟题 379 及答案解析(总分：100.00，做题时间：90 分钟)一、Reading Comprehensio(总题数：0，分数：0.00)LG Display, the world“s second-biggest flat-panel display maker, is betting big on large-scale OLED television panels, brushing aside industry scepticism about the chances of the technology displacing mainstream liquid c

2、rystal display. OLED, or organic light-emitting diode, panels use ultra-thin, lighter technology to produce higher picture quality and lower power consumption than LCD screens. They feature on Samsung Electronics“ Galaxy smartphones and tablets. LG aims to steal a march in the potentially lucrative

3、market on crosstown South Korean rival and world leader Samsung Display, which is instead focusing on improving LCD panels for ultra high-definition TVs. The diverging strategies reflect the mixed views about the future of OLED technology, long touted by industry watchers as a potential game-changer

4、 for the $94bn global TV industry but which remains clouded by doubts about its commercial value because of high production costs and technological challenges. Behind LG“s aggressive investment to expand OLED production capacity lies the belief that demand for OLED TVs will take off once they are mo

5、re affordable. “LCD has no future. The Chinese can make even ultra high-definition TVs at lower costs,“ says Oh Chang-ho, senior vice-president of LG“s OLED TV development division. “We cannot win this price war. For survival, we have to make products that they cannot make.“ Sony launched the world“

6、s first commercial OLED TV in 2007 but the Japanese company was surpassed by Korean rivals. However, mass producing large OLED TVs is difficult and more costly. Samsung and LG rolled out 55-inch full-HD (high definition) curved OLED TVs last year but the hefty price tagroughly $15,000deterred consum

7、ers. LG reckons it is finally in a position to cut costs, thanks to breakthroughs to boost production efficiency and resolve colour distortions. It plans to introduce curved ultra high-definition OLED TVs as large as 77 inches this year. The company is convinced OLED can breathe new life into consum

8、er demand because the technology, best suited for flexible display, allows TVs to be made in all sorts of shapes. OLED panels are easier to bend than LCDs because they work without a backlight. LG has recently developed an 18-inch rollable OLED panel as well as the same-size transparent OLED panel a

9、nd is confident that it can develop an Ultra HD flexible and transparent OLED panel of more than 60 inches by 2017. But LG is in the minority with its confidence in the budding technology. Its rivals remain sidelined by concerns that OLED may go the way of plasmaonce promising technology that has be

10、en expensive to develop and ultimately not widely adopted. Samsung Display has opted to push the technological boundaries of LCD panels with high-margin ultra high-definition TVs capable of displaying four times the resolution of existing HD TVs.（分数：20.00）(1).Compared with LCD screens, OLED has foll

11、owing advantages except _.（分数：4.00）A.Panels of OLED use ultra-thin and lighter technologyB.Panels of OLED produce higher picture qualityC.The production of OLED costs more than LCDD.OLED has lower power consumption(2).Why do people hold mixed views about the future of OLED technology?（分数：4.00）A.Beca

12、use the production of OLED costs too much.B.Because OLED is confronted with many technological challenges.C.Because many industry watchers speak highly of OLED technology.D.Because people appreciate the technology but doubt its commercial value.(3).The phrase “rolled out“ (Line 3, Para.7) can be rep

13、laced by _.（分数：4.00）A.got outB.spreadC.launchedD.tumbled(4).What is the new life into consumer demand according to LG Company?（分数：4.00）A.The higher picture quality.B.The feature that OLED panels are easier to bend.C.The lower power consumption.D.The large size of OLED screens.(5).What is author“s at

14、titude towards OLED?（分数：4.00）A.Neutral.B.Approving.C.Disapproving.D.Radical.Two new studies offer signs that this could be changing quickly. One offers a new way to produce solar cells more cheaply and safely than current methods. The other indicates that concentrating solar power, which uses the su

15、n“s energy to heat up a liquid that drives a turbine, could supply “a substantial amount of current energy demand.“ In a study released Wednesday in journal Nature, University of Liverpool“s Jon Major and several other researchers announced that they had found that magnesium chloride, which is used

16、in making tofu, bath salts and applied to roads in the winter could replace cadmium chloride in the making of second-generation, thin-film solar cells. Speaking in a teleconference from Copenhagen, Major said magnesium chloride, which is extracted from seawater, would cost $0.001 per gram compared t

17、o $0.3 for cadmium chloride. It would also eliminate the challenges and expense of handling cadmium chloride, a highly toxic compound that requires elaborate safety measures to protect workers during its manufacture and a special disposal process when panels are no longer needed. “So what we have do

18、ne without any loss of efficiency is to replace expensive and highly toxic material with one that is completely benign and much lower in cost in the process,“ Major said. “This offers a great cost benefit for production of these kinds of solar cells and could help make a step change in the productio

19、n of them.“ The solar market is currently dominated by panels made with silicon. In a bid to make solar more competitive, there is growing interest from companies like First Solar in developing solar cells using cadmium telluride, which is more efficient and more flexible so it could be applied many

20、 more surfaces including windows. To make these cadmium telluride cells, a thin layer of cadmium chloride is applied to the solar cell, and then heated up in a furnace. This is considered the activation process, Major said, helping to boost a cell“s efficiency from around 1 percent to as much as 20

21、percent. In a bid to find a safer alternative, Major and his team first looked at sodium chloride, but found the efficiency was about half of cadmium chloride. Another option was difluoro chloromethane but that has been linked to ozone depletion and its use has been restricted by international agree

22、ments. They then turned to magnesium chloride and found that it was just as efficient as comparable and could be applied without any expensive safety equipment. Major said magnesium chloride isn“t being used at the moment, but was hopeful it “would be taken up by research and hopefully by industry o

23、nce this work is publicized.“ Steve Krum, the director of corporate communications for First Solar, would only say cadmium chloride remains “critical part“ of its production process and that it was not a “major cost driver in our manufacturing process.“（分数：20.00）(1).What does “a new way to produce s

24、olar cells more cheaply and safely than current methods“ in the first paragraph refer to?（分数：4.00）A.Using cadmium chloride as material to produce solar cells.B.Using magnesium chloride as material to produce solar cells.C.Using sodium chloride as material to produce solar cells.D.Using difluoro chlo

25、romethane as material to produce solar cells.(2).Which of the following is not the reason why cadmium chloride is replaced by magnesium chloride?（分数：4.00）A.Magnesium chloride is cheaper than cadmium chloride.B.Magnesium chloride has no poison.C.The efficiency of magnesium chloride is as high as cadm

26、ium chloride.D.Magnesium chloride can produce more efficiency than cadmium chloride.(3).The word “benign“ (Line 2, Para.4) may be replaced by _.（分数：4.00）A.sweetB.humaneC.nontoxicD.amiable(4).Why do many companies become more interested in developing solar cells using cadmium telluride?（分数：4.00）A.Bec

27、ause cadmium telluride is more efficient and more flexible.B.Because cadmium chloride is needed in the process.C.Because it is much safer than magnesium chloride.D.Because it can complete the developing process independently.(5).The best title of the passage may be _.（分数：4.00）A.How to Make Solar Cel

28、lsB.The Future of Solar PowerC.Magnesium Chloride is to Make Solar CellsD.Magnesium Chloride Reolaced Cadmium ChlorideIt may seem ridiculous, but in the hunt for sources of alternative energy researchers have come up with fuel cells which are powered by cheeseor at least whey, a by-product in cheese

29、 making. Whey is rich in lactose, a sugar which Georgia Antonopoulou, a biochemical engineer at the University of Patras, Greece, says can be consumed by cultures of bacteria contained within a fuel cell to generate an electric current. Microbial fuel cells, as such devices are known, are not a new

30、idea but they are attracting more attention. The organic contents of whey pose an environmental hazard and many governments now impose strict regulations requiring factories to pay for its treatment before disposal. Whey constitutes about 70% of the volume of the milk were used to make cheese. So, j

31、ust one small feta facility will need to dispose of as such as 4,000 tonnes of whey in a single year, says Dr Antonopoulou. Microbial fuel cells could help, and not just in the cheese-making industry. Breweries, pig farms, food-processing plants and even sewage works could gain from the technology.

32、Traditional fuel cells work by using a catalytic material to oxidize a fuel, such as hydrogen, and make an electric current flow between two electrodes. Microbial fuel cells function in much the same way except that the catalytic reactions are carried out by bacteria contained within the fuel-cell c

33、hamber. Under anaerobic conditions (where oxygen is absent), metabolising the fuel by feeding off it and in doing so produce natural chemical reactions that produce a current. In theory microbial fuel cells can run on almost any kind of organic matters, says Chris Melhuish, head of the Bristol Robot

34、ics Laboratory, England. “All you have to do is match the microbial culture with the type of stuff you want to use as fuel,“ he says. Dr Melhuish has been trying to power robots on domestic waste-water, but it is tricky. Ideally you would want to use cheap raw-waste products, he says. But traditiona

35、lly the fuel cells work best with a refined fuel in the form of solutions containing synthetic sugars, such as glucose. However, Dr Antonopoulou has now shown that, using a culture of bacteria obtained from her local waste-water plant, it is possible to get almost as much power from raw whey as from

36、 refined fuel, provided the whey is diluted. The trouble is the power output still only amounts to milliwatts, barely enough to trickle-charge a cellphone. And working with raw waste water also presents challenges. Initially Dr Antonopoulou and her colleagues found that the coulombic efficiency of t

37、heir cells-a measure of how many electrons produced actually flow into a circuit-was particularly low, at around just 2%. This turned out to be because a second set of microbes, within the whey itself, was absorbing them. So, by sterilizing the whey first to kill these other bugs they have now boost

38、ed the coulombic efficiency to around 25%.（分数：20.00）(1).What is the main idea of the first paragraph?（分数：4.00）A.Fuel cells can be powered by cheese.B.Lactose rich in whey can generate an electric currentC.Fuel cells can be powered by cheese for whey in it.D.The idea that fuel cells can be powered by

39、 cheese may seem ridiculous.(2).Which of the following may not benefit from microbial fuel cells?（分数：4.00）A.Feta facilities.B.Toy factories.C.Sewage plants.D.Breweries.(3).What is the function principle of microbial fuel cells?（分数：4.00）A.The catalytic reactions are carried out by bacteria contained

40、within the fuel-cell chamber.B.The catalytic reactions are carried out by bacteria outside the fuel-cell chamber.C.The catalytic reactions are carried out by bacteria in the aerobic conditions.D.The catalytic reactions are carried out by bacteria via unnatural chemical reactions.(4).Why is the coulo

41、mbic efficiency of microbial fuel cells particularly low?（分数：4.00）A.Because it is difficult to work with raw waste water.B.Because the fuel is hard to obtain.C.Because the scientists haven“t got the technology to sterilize the bacteria in whey.D.Because another kind of microbes is absorbing the elec

42、trons at the same time.(5).The best title of the passage may be _.（分数：4.00）A.Whey Can Pose Environmental HarzardB.The Whey to Greener ElectricityC.Why the Whey Can Generate ElectricityD.A Seemingly Ridiculous ResearchHoneybee populations declined by 13.6% over the winter, according to a survey of be

43、ekeepers across England. Losses were most severe in the north-east, where the survey recorded a loss rate of 17.1%. Experts worry that the declines will affect plant productivity. There are also concerns that the declines, along with drought conditions in some area, will mean less English honey this

44、 year. Martin Smith, president of the British Beekeepers Association, which carried out the survey, said: “If this was measured against similar losses in livestock, it would be seen as disastrous and there would be great concern on the knock-on impact of food prices.“ Beekeepers are puzzled by the d

45、ecline because the cold winter and early spring should have favoured bees. They stay “clustered“ tightly in their hives when it is cold and dry, saving energy for spring foraging when the temperature rises about 12. However, there is good news that the rate of colony loss has slowed. Four years ago,

46、 one in three hives was wiped out. Beekeepers suspect that poor nutrition is a likely cause of weakness in adult bees that makes them succumb to diseases spread by a parasitic mite. “The varroa mite is the number one reason why people lose bees, so the government needs to increase research to cure d

47、iseases caused by varroa,“ said Smith. “But a colony that has a good source of pollen and nectar will go into winter more strongly and better able to fend off disease.“ The association is calling on everyone who has a garden, small, to plant bee-friendly plants this summer. “It is really important t

48、hat there are flowering nectar-rich plants around in August, September and October to provide the nutrition that“s needed so the bees can top up their stores of honey in the hive to see them through winter,“ said Smith. A campaign being launched next week to save all bees, spearheaded by Sam Roddick

49、 and Neal“s Yard Remedies, pins the blame for the decline on pesticide. It will start a petition to hand to Downing Street in October to ban the use of a class of pesticides that has been implicated in bee deaths across the world. Roddick said, “These neonicotinoid pesticides penetrate the plant and indiscriminately attack the nervous system of insects that feed off them, disorientating bees, impairing their foraging ability and weakening their immune system, causing bee Aids. On current evidence, Italy, Germany and Slovenia have banned some varieties. In the UK,